[6.x] [vega] support HTML tooltips (#17632)#18642

Merged

nyurik merged 1 commit intoelastic:6.xfrom nyurik:backport/6.x/pr-17632

Apr 27, 2018

+298-2

Commits on Apr 27, 2018

[vega] support HTML tooltips (elastic#17632 )
nyurik
committed